A post mortem examination's due to take place today on the two-month-old child who was killed in Belfast.
The baby boy lost his life in Ardoyne on Tuesday night, and a two-year-old girl's in intensive care.
A 29-year-old woman was arrested on suspicion of murder and attempted murder, and is in police custody.
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Allison Morris, the Belfast Telegraph's crime correspondent, expects further developments soon.
